The scale of competition impacts parasite virulence evolution

Noël, Elsa; Lefèvre, Sophie; Varoqui, Marion; Duncan, Alison B.

doi:10.1007/s10682-022-10199-0

Cited by 4 publications

(2 citation statements)

References 44 publications

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“…This damage, presumably negatively correlated with plant fitness ( Fineblum & Rausher, 1995 ) is visible as chlorotic lesions on the leaf surface. Thus, it can be easily quantified ( Mira et al, 2022 ; Supplementary Figure S1 ), being a reliable measure of virulence ( Noël et al, 2022 ). Spider mites can transmit to nearby hosts from early on in an infection, or overexploit the host plant before transmission occurs ( Bitume et al, 2013 ; Smitley & Kennedy, 1985 ).…”

Section: Introductionmentioning

confidence: 99%

Limited host availability disrupts the genetic correlation between virulence and transmission

et al. 2023

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Virulence is expected to be linked to parasite fitness via transmission. However, it is not clear whether this relationship is genetically determined, nor if it differs when transmission occurs continuously during, or only at the end of, the infection period. Here, we used inbred lines of the macroparasitic spider mite Tetranychus urticae to disentangle genetic vs. nongenetic correlations among traits, while varying parasite density and opportunities for transmission. A positive genetic correlation between virulence and the number of transmitting stages produced was found under continuous transmission. However, if transmission occurred only at the end of the infection period, this genetic correlation disappeared. Instead, we observed a negative relationship between virulence and the number of transmitting stages, driven by density dependence. Thus, within-host density dependence caused by reduced opportunities for transmission may hamper selection for higher virulence, providing a novel explanation as to why limited host availability leads to lower virulence.

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Section: Introductionmentioning

confidence: 99%

Limited host availability disrupts the genetic correlation between virulence and transmission

et al. 2023

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“…Thus, with sufficient supply of susceptible hosts, more virulent parasites are favoured in spatial grids [69,70] or at the front of advancing epidemics [71]. Experimental tests in microcosm populations [72][73][74] corroborated these theoretical predictions by artificially manipulating spatial structure/connectedness (but see [75]). Data from natural populations are scarce and interpretations of observed patterns potentially difficult [76,77].…”

Section: The Case Of Parasite Virulence Evolutionmentioning

confidence: 76%

Dispersal and eco-evolutionary dynamics in antagonistic species interactions

Zilio,

Deshpande,

Duncan

et al. 2023

Preprint

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Dispersal fuels the interplay between ecology, evolution and adaptation across spatial and temporal scales. Dispersal also determines the encounter between natural enemies and can produce eco-evolutionary feedbacks with potentially profound consequences for the geographic distribution and genetic diversity of antagonistically interacting species. Although both dispersal and interaction traits, such as virulence or resistance, evolve, their concurrent evolution and impact for these dynamics remain understudied. We advocate for a more comprehensive framework, integrating dispersal, interaction and life-history trait evolution in a multi-species context. This integration may substantially alter our current vision of coevolutionary dynamics, and influence projections of range expansion, biological invasions or spreading epidemics, which is particularly relevant with ongoing global change and habitat alteration.

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